Propane Autogas: Fuel for Today’s Fleets

Propane autogas is a safe, domestically produced fuel with a robust infrastructure and economic and environmental benefits. It’s the same fuel used to fuel familiar items, like backyard grills and residential water heaters. It’s American-made with more than 90% of the nation’s supply coming from the United States and an additional 7% from Canada.

Cost-cutting Economic Solution

ROUSH CleanTech propane autogas fuel systems help fleet managers meet their primary goal of maintaining the lowest possible total cost of ownership. Historically, propane autogas costs about 40% less than gasoline and 50% less than diesel per gallon. Maintenance service and costs are reduced due to the fuel’s clean operation. Propane removes the complexity and cost of after-treatment measures since it doesn’t require additional fluids or filters; exhaust after-treatment or diesel emissions fluids; particulate trap systems; turbochargers or intercoolers. Since the fuel runs cleanly through the engine, fleets report savings of 30 to 50% on filters and fluids.

Propane autogas vehicles have no cold-start issues and warm up quickly, which can save fleets both time and money on equipment and staff. And with quick fill-up time and a long-driving range, propane autogas vehicles stay on the road.

total cost of ownership calculator

Funding Opportunities Available

Fleets can successfully transition to propane autogas without incentives, but funding further accelerates your savings. Since propane is classified as an alternative fuel by the Department of Energy, there are a number of incentive and funding programs to encourage adoption. These include federal and state grants, alternative fuel tax credits, Diesel Emissions Reduction Act (DERA) Program, Volkswagen’s Environmental Mitigation Trust and the federal Clean School Bus Program. To learn more, visit our funding page here.

Significant Emissions Reduction

Vehicles that run on propane autogas emit fewer greenhouse gases, smog-producing hydrocarbons and particulate emissions than conventional fuels. Propane autogas is naturally much lower in nitrogen oxides than diesel and gasoline. Nitrogen oxide emissions are federally regulated due to their negative impact on human health and the environment. They can trigger health problems, such as asthma, bronchitis and other respiratory issues, and environmental problems, such as acid rain and deteriorated water quality.

Emission ConstituentROUSH Propane
Certification Level
% Lower than EPA / CARB Standard
NOx (Nitrogen Oxides)0.0190% ↓
HCHO (Formaldehyde)0.00190% ↓
PM (Particulate Matter)0.00280% ↓
NMHC (Non-Methane Hydrocarbons)0.0657% ↓
CO (Carbon Monoxide)5.065% ↓
GHG Carbon Dioxide (CO2)612<1% ↓
GHG Methane (CH4)0.0370% ↓
GHG Nitrous Oxide (N20)0.0280% ↓

According to the World LP Gas Association, vehicles fueled by propane autogas emit 96% less nitrogen oxides than diesel and 68% less than gasoline. And, according to a 2019 West Virginia University study with school buses, diesel emissions are 15 to 19 times higher than with propane.

ROUSH CleanTech propane engines are certified to either 0.05 g/bhp-hr or 0.02 g/bhp-hr, making them up to 90% cleaner than the EPA’s strictest federal emissions standard.

Safe to Use

Propane autogas is an approved clean alternative fuel under the Clean Air Act of 1990. There are more than 260,000 propane vehicles in the United States and over 27 million worldwide, including school buses, taxis, paratransit shuttles, and delivery and construction trucks. Other safety features include:

  • Propane autogas is a nontoxic, non-carcinogenic and non-corrosive fuel classified as a non-contaminant by the EPA.
  • Propane autogas poses no harm to groundwater or soil.
  • Propane autogas will not ignite when combined with air unless the source of ignition reaches at least 940 degrees Fahrenheit. In contrast, gasoline will ignite when the source of ignition reaches 430 degrees.
  • Constructed from carbon steel, propane autogas fuel tanks are 20 times more puncture-resistant than gasoline or diesel tanks. They comply with American Society of Mechanical Engineers.
  • Propane is 270 times more compact as a liquid than as a gas, making it safe and economical to store and transport.
  • Propane autogas engine fuel systems are fitted with safety devices and shut-off valves that function automatically if the fuel line ruptures.
  • Unlike gas or diesel, propane autogas is part of a close-looped system, meaning the fuel is never exposed to air and won’t spill.
  • Vehicles fueled by propane autogas reduce noise levels by about 50% when compared diesel models, making it easier for drivers to focus on the road ahead.

Three Ways to Fill-up with Propane

Fueling with propane autogas is easy and takes about the same length of time as fueling with gasoline or diesel. Propane autogas offers multiple options for infrastructure setups that will keep your budget in check. There are three main ways to fuel propane vehicles.

1 Onsite propane stations can easily take care of your fueling needs. Propane providers specialize in helping fleets choose the right fueling option based on your fleet size, routes, budget and facility space. Your local fuel supplier can install low or no-cost propane infrastructure with a fueling contract.

AmeriGas Propane Tank

Kyrene Elementary

ROUSH CleanTech

Bend LaPine Schools

2 Mobile fueling is another option where your local propane supplier comes to your location and fills up your vehicles directly from their bobtail truck.

Boston PS Transportation Wet Fueling Operation

3 Public stations can be a solution for fleets with limited space. There are thousands of propane stations across the U.S. To find a station near you, visit the U.S. Energy Department’s Alternative Fuels Data Center.

AFDC fuel locator

Dedicated Propane System

ROUSH CleanTech vehicles come equipped with the necessary components to operate the vehicle. This includes a liquid propane autogas fuel system that consists of the fuel rail assembly, fuel line assembly, fuel tank assembly and the powertrain control system. These vehicles have the necessary hardened valves and valve seats installed directly from the factory.

State-of-the-Art Technology

With modern systems, propane remains in a liquid state until it gets to the cylinder, removing the cold-start issues associated with vapor technology propane systems of the past. ROUSH CleanTech’s dedicated propane autogas fuel systems start immediately in weather as cold as negative -40 degrees Fahrenheit. Vehicles equipped with ROUSH CleanTech’s propane autogas fuel systems retain equivalent horsepower, torque, towing capacity and warranty coverage as their gas and diesel counterparts. The Class 4-7 commercial vehicles can achieve a range of up to 350 miles and school buses up to 400 miles on a single fueling.

ROUSH CleanTech was the first ever company to develop a propane engine that brings emission levels to near-zero as defined by California Air Resources Board.